package com.qingcheng.service.impl;

import com.alibaba.dubbo.config.annotation.Service;
import com.qingcheng.service.goods.SkuSearchService;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.index.query.*;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service
public class SkuSearchServiceImpl implements SkuSearchService {

    @Autowired
    private RestHighLevelClient restHighLevelClient;

    public Map search(Map<String, String> searchMap) throws Exception{
        SearchRequest searchRequest = new SearchRequest("sku");
        searchRequest.types("doc");

        //条件

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        MatchQueryBuilder matchQueryBuilder = QueryBuilders.matchQuery("name",searchMap.get("keywords"));

        //分类信息过滤
        if (searchMap.get("category")!=null){
            TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("categoryName",searchMap.get("category"));
        }

        boolQueryBuilder.must(matchQueryBuilder);
        searchSourceBuilder.query(boolQueryBuilder);

        //分类聚合  sku_category 自定义    categoryName要分类的字段
        TermsAggregationBuilder termsAggregationBuilder = AggregationBuilders.terms("sku_category").field("categoryName");
        searchSourceBuilder.aggregation(termsAggregationBuilder);


        //分页查询
        if (searchMap.get("pageNo")==null){
            searchMap.put("pageNo","1");
        }
        Integer pageNo = Integer.parseInt(searchMap.get("pageNo"));
        Integer size = 10;
        Integer from = (pageNo-1)*size;//计算分页公式 ==>    (页码-1)*数量
        searchSourceBuilder.from(from);
        searchSourceBuilder.size(size);

        //排序
        String sort = searchMap.get("sort");//排序字段
        String sortOrder = searchMap.get("sortOrder");//排序规则
        if (!"".equals(sort)){
            searchSourceBuilder.sort(sort, SortOrder.valueOf(sortOrder));
        }

        //高亮查询
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.field("name").preTags("<font style='color:red'>").postTags("</font>");
        searchSourceBuilder.highlighter(highlightBuilder);

        searchRequest.source(searchSourceBuilder);
        SearchResponse response = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);


        //==>封装结果集
        Map resultMap = new HashMap();

        SearchHits hitsSearchHits = response.getHits();
        SearchHit[] hits = hitsSearchHits.getHits();

        List<Map<String, Object>> resultList = new ArrayList<Map<String, Object>>();
        for (SearchHit hit : hits) {
            Map<String, Object> map = hit.getSourceAsMap();

            //name高亮处理
            Map<String, HighlightField> highlightFields = hit.getHighlightFields();
            HighlightField name = highlightFields.get("name");
            Text[] fragments = name.fragments();
            map.put("name",fragments[0].toString());//用高亮的内容替换原内容

            resultList.add(map);
        }
        resultMap.put("rows",resultList);

        //==>封装分类商品
        Aggregations aggregations = response.getAggregations();
        Map<String, Aggregation> aggregationMap = aggregations.getAsMap();
        Terms terms = (Terms) aggregationMap.get("sku_category");

        List<? extends Terms.Bucket> buckets =  terms.getBuckets();
        List<String> categoryList=new ArrayList();
        for( Terms.Bucket bucket:buckets ){
            categoryList.add(bucket.getKeyAsString());
        }
        resultMap.put("categoryList",categoryList);

        //==>分页结果封装
        long totalHits = hitsSearchHits.getTotalHits();//原始记录的总条数
        long totalPages = (totalHits%size==0)?totalHits/size:totalHits/size+1;
        resultMap.put("totalPages",totalPages);

        return resultMap;
    }
}
